avcodec/diracdec: Check dimensions which are closer to what is allocated in...

avcodec/diracdec: Check dimensions which are closer to what is allocated in alloc_sequence_buffers()

Fixes OOM
Fixes: 2674/clusterfuzz-testcase-minimized-4999700518273024

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/diracdec.c

@@ -2090,6 +2090,9 @@ static int dirac_decode_data_unit(AVCodecContext *avctx, const uint8_t *buf, int
             return ret;
         }
 
+        if (CALC_PADDING((int64_t)dsh->width, MAX_DWT_LEVELS) * CALC_PADDING((int64_t)dsh->height, MAX_DWT_LEVELS) > avctx->max_pixels)
+            ret = AVERROR(ERANGE);
+        if (ret >= 0)
             ret = ff_set_dimensions(avctx, dsh->width, dsh->height);
         if (ret < 0) {
             av_freep(&dsh);